"Slippery" tree (3)
I believe the answer is:
elm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slippery tree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for elm that I've seen before include "Tree of the genus Ulmus" , "Furniture wood" , "One [TYPE OF TREE]" , "Kind of 19" , "Wood in pelmet" .)